A Kansas City teenager was charged Friday in the September robbery and killing of a developmentally disabled man on a central Kansas City street.

Jackson County prosecutors charged 17-year-old Landrain Miller, also known as Landrian Miller, with second-degree murder and armed criminal action in the Sept. 26 killing of Timothy M. Riley.

Riley, 38, was on his way home from his part-time job as a maintenance man for a Kansas City day care center when he was shot in the 4100 block of South Benton Street.

Witnesses told police that they had seen Riley being chased down the street by someone. The two began fighting before the attacker pulled out a handgun and shot Riley. The attacker took items from Riley’s pockets before running away, according to the witness accounts.

Another witness told police about hearing a shot and encountering an “emotionally distraught” Miller, who said he had just robbed and shot someone, according to court documents.

On Nov. 29, in an undercover operation, police purchased a handgun from Miller. Testing revealed that it fired the bullet that killed Riley, court records said.

When questioned Thursday, Miller told detectives that he had shot the victim accidentally, according to court documents.

Riley, who was known as Tim, attended a state school for disabled students and worked for years at Blue Valley Industries, a nonprofit organization that employs disabled people, relatives said.

His grandmother Joyce Riley said Friday that she appreciated the hard work of police detectives and people in the community who provided information that led to an arrest.

“We’re glad someone was caught, but we also feel sympathy for the young man’s family,” she said.

Riley said the family is focusing on all of the good things Tim did while praying for peace in the community.

“We need to pray that people will have more respect for each other, more love,” she said. “It’s so needed.”

To reach Tony Rizzo, call 816-234-4435 or send email to trizzo@kcstar.com.