Martin was tall and lanky — only 140 pounds, according to the family's attorney — and his nickname was "Slimm."
The teen spent a big part of his week living with his father in a one-story, peach-colored home. Neighbor Fred Collins Jr. said he would see Trayvon Martin outside every week mowing the lawn and trimming the trees. The teen also helped Collins' son learn how to ride a bike.
"He was coaching him, giving him words of advice, encouragement," Collins said.
No one answered the door on a recent afternoon, and a child's plastic tricycle sat in the driveway.
Tracy Martin often recounted how his son saved his life. The elder Martin had begun heating up some oil to fry fish and fell asleep. The grease caught fire, and when Tracy Martin awoke and tried to put out the flames, he spilled the oil on his legs, severely burning himself. Trayvon Martin pulled his father out of the home and called 911.
Martin's parents kept a close eye on him, but they didn't have to be too strict, since he stayed out of trouble, Collins said. However, he had recently been suspended from school for five days for tardiness, his English teacher, Michelle Kypriss, told the Orlando Sentinel. School officials did not respond to a request for comment.
Martin's father was not happy and grounded the teen for the duration of the suspension.
Trayvon "knew he was wrong," Horton said.
Under state privacy law, only serious felonies appear on juveniles' public criminal records, and Martin did not have one. Citing the same law, Sanford police Sgt. David Morgenstern said he could neither confirm nor deny the family's statement that Martin had never gotten in legal trouble.
Martin dreamed of becoming a pilot. He had flown on school vacations to various places around the country with his mother, skiing in Colorado one year, going off to Texas another.
"There's no little black kids that want to be pilots," Horton joked with him when he was about 13.
"Well, I'll be the first one," the teen replied.
At Dr. Michael M. Krop High School, where Martin was a junior, he was on the quiet side, but he would sit in the middle of the classroom, participate in class and especially liked math.
Schoolmates remembered his humorous side.
"Brrrrian!" he would call out, rolling his r's as is done in Spanish, whenever 16-year-old Brian Paz got a phone call from his Colombian mother, the friend recalled.
"I'd just burst out laughing," Paz said.
Paz and other friends said Martin liked rap music and funny movies. He had written some lyrics, though he hadn't had a chance yet to perform them. Martin was especially a fan of a student musical group at his school called Bison. He had two of the group's pins on his backpack and helped spread the word about shows.
John Emmanuel, 17, said the group was about encouraging young men to be strong, independent leaders.
"That's how we liked to think of ourselves," Emmanuel said.
Martin had gone up to Sanford to visit his father's fiancÉe, who lived there with her young son. Friends said Martin regarded the boy as his little brother and had been looking forward to watching the NBA All-Star game with him that weekend.
On that Sunday, Martin went out to get candy and an iced tea at a convenience store and was walking back to the fiancee's townhouse. Zimmerman, 28, spotted him and told a police dispatcher: "This guy looks like he is up to no good — he is on drugs or something."
After the shooting, Zimmerman claimed that Martin attacked him as he was returning to his truck.
But Martin's friends said they find that hard to believe. They said they had never seen him fight at all.
"As far as attacking the guy without him attacking him, no way," Horton said.
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