The Felix Mystery:
Case of the Missing
Investigated by the
2011 Challenge Class
• Victim: Felix Navidad
• Felix was not very well-liked because he
continually criticized everyone and everything
• Felix inherited a considerable amount of money.
• Felix had just recently bought a two-bedroom
one-bath beach house located in a very expensive
• Threw a weekend housewarming party for four of
his closest friends.
• Although Felix considered these people to be his
best friends, none of them liked him very much,
and they probably only accepted the invitation
because he had recently announced that they were
all named equally in his will.
• All four of Felix’s guests are suspects in
• When the police arrived, they found no
external injuries and no blood on the
• The body disappeared on the way to the
morgue, before an autopsy could be performed
to figure out how he died.
• We not only don’t know who killed Felix, if
it was a murder, but we don’t even know how
• There is even some speculation that Felix is
not dead, but staged the crime for his own
reasons. Reports that he has been seen at the
local bus station have not been confirmed.
Statement: “My name is Alfredo and I am a
computer programmer. I saw Felix sitting on
the patio, so I joined him at about 2:00pm. We
each had a can of cola, but we poured them
into cups to drink. I set down my cup of cola
and went to the bathroom at about 2:45pm.
When I came back 10 minutes later, I found
Felix lying dead on the floor, so I called out to
the others at about 3:00.”
What we know
•Alfredo has a cut on his left hand.
•He has a brown felt pen in his pocket.
•He plays guitar.
•He was wearing tennis shoes and a blue
Statement: “My name is Kendra and I am an
artist. I went upstairs to take a shower in the
bathroom at about 2:30pm. I think that I heard
a woman’s voice downstairs. I came downstairs
as soon as Alfredo called out at about 3:00.”
What we know
•Kendra has white powder on her tennis shoes.
•She has pierced ears
Statement: “My name is Gene and I am an
office manager. I took my dog Sasha down to
the beach for a walk at noon. After taking off
my sandals, I fell asleep with Sasha lying next
to me. When Alfredo called out at about
3:00pm, I woke up, and brought Sasha up right
away. I never let Sasha come inside or on to
Statement: “My name is Vera and I am a
chemist. I went for a walk at about 2:00pm in
the hills behind the house. I came back when I
heard Alfredo call for help at about 3:00.”
What we know
•A white powder was found on Vera’s tennis
•Vera was wearing a white wool sweater.
•She loves candies with brown coatings.
•She has pierced ears.
• Mapping the Crime Scene
• Collecting the Evidence
• Analyzing the Evidence
• Reconstructing the Crime
• Drawing a Conclusion
Mapping the Crime Scene
• We divided the crime
scene into 8 sections
and drew all of it.
• We paid attention to
the details in the crime
scene, like footprints,
evidence, and the body
Collecting the Evidence
The following items were collected • Dog hair
and put in bags: • Towel
• 2 Coca-Cola cans • Pencil shavings
• Guitar pick • Comb with hair on it
• White powder • Folder
• 2 pieces of string • Ice cube tray with water in it
• Snickers wrapper • Body outline
• Dog prints • Blood drips
• Human foot prints • Nails
• Paint brush • Alarm clock
• 2 cups partly full of a brown liquid • Hair
• Trash can • sunglasses
Analyzing the Evidence
• We used the following
tests to analyze the
• Fiber Analysis
• pH Testing
• DNA Analysis
• Tape Lifts
• Handwriting Analysis
• Powder Revealing
• Chemistry Reactions
• Fiber analysis
is the study of
• We looked at
fibers through a
were trying to
find out if the
fiber was cotton
• We compared fingerprints
from the suspects with
fingerprints found at the
• The crime scene
fingerprints were found on
Felix and Alfredo’s cups.
• Kendra’s prints were found
on Felix’s cup, but not on
• The fingerprints were
revealed by putting Krazy
glue in a bag with the
• We used pH paper to test
the Coke in Felix and
• We compared it to normal
Coke by dipping the pH
paper in the real coke
then in Alfredo’s and
Felix’s cokes and
comparing the reactions.
• We found out that Felix’s
coke was different from
From left to right:
Felix’s Normal Alfredo’s
• We used DNA analysis
to look at a sample
of hair evidence and
compare it to our
• The hair found on the
comb was Felix’s. We
know that because it
matched the DNA
sample of his hair.
• Chromatography is when you
color on a paper towel or
napkin and then you stick
the end of the paper towel
in water and it absorbs
the color and makes it From left to right:
easier to see and tell Food coloring, evidence, brown pen
apart from other inks.
• We took a napkin that had
black stuff on it and used
chromatography to figure
out if what was on the
napkin was brown food
coloring or brown marker.
• The napkin had food
coloring on it.
• We found a secret note on
the folder (evidence). The
message was indented into
the folder by someone
writing on top of it.
• We used brown powder to
reveal the note. We put it
on and brushed it off
carefully. We kept
brushing and the message
• It said, “Dear Martha, The
deed is done. Felix is
dead and I’ll be rich
soon. Love, Vera”
• The secret note was
written in regular
handwriting and not
• We took samples of each
suspect’s handwriting and
found that Kendra’s
matched it most clearly.
• Kendra must have framed
Vera because Vera’s name
was on it.
• We did a tape lift on
every suspect’s shirt to
look for fibers, hair, and
• Kendra had dog hair and
• Vera had a piece of hair
in her hood.
• Gene had yarn and dog hair
• Alfredo had dog hair and
Ice Cube Test
• We used pH paper on the
ice cube water to compare
it to tap water.
• We saw that the ice cube Ice Normal
water was way different Cubes Water
than the tap water.
• We think the ice cube
water may have been
poisoned by Kendra.
• We compared powders to see which had been used to
create the fake blood in the crime scene, and if
the same powder was on Kendra and Vera’s shoes.
• We put drops of iodine
onto samples of baking
soda and cornstarch to
• The test showed that
the powder used to make
fake blood was the same
as the powder on Kendra
and Vera’s shoes –
Gene Vera Alfredo Kendra
Poule Cruise Fettuccine Goode Felix
Hard Hard Hard Hard Hard
Footprints White Coca-Cola Folder w/ Body
Dogprints powder Coke Can secret note outline
Piece of on shoe Guitar Pick Ripped “KG” Coca-Cola
string String Towel
Based on the evidence found, we believe that Kendra
• We believe Kendra poisoned Felix by putting
poisoned ice cubes in his drink while Alfredo was
in the bathroom. She may have poisoned him to get
money from his death because Felix had named each
of the suspects equally in his will.
• We believe she led the blind dog, Sasha, into the
house with the ripped “KG” towel that smelled like
a man’s body spray (like the dog’s master) trying
to frame Gene. She may have also used Gene’s shoes.
• Kendra also tried to frame Vera, writing a note but
signing Vera’s name.
• The white powder found on Kendra and Vera’s shoes
was the same powder that was used to make the fake
blood drops found at the crime scene.