CARROLLTON, Texas (AP) _ A 22-year old man was held Tuesday in a convenience store robbery and shooting death of a teen-ager that gained national attention because of a videotape of the slaying, officials said.

Matthew McKay,17, was shot at point-blank range during the November robbery in Carrollton, a suburb of Dallas. He died later in the hospital.

A store camera taped the robbery and the tape was later broadcast nation- wide as officials sought information in the shooting.

Police believe a Flint, Mich. man that was arrested and taken to Dallas Friday on separate charges of aggravated robbery in another Dallas suburb may be the man the camera filmed shooting McKay, said Lt. Pete Cole.

The man was held at the Lew Sterrett Justice Center on $500,000 bond for the aggravated robbery charge.

Capital murder charges were being prepared against the man, who had been a suspect in McKay's death since December, Cole said.

The man was arrested on police information and not on information provided by a public source, Cole said. He said the broadcast had led to telephone tips on more than 300 possible suspects.

"We are not obligated to pay a reward to anyone," Cole said. "But if any- one wants to come forward with more information to enhance the evidence ... we still have some reward money left."

A reward fund totals about $15,000, Cole said.

The victim's mother, Betsy McKay, said she felt "a sense of relief that he can't hurt anyone else."

McKay, who lived in Oklahoma City, was returning from a trip to Houston and stopped at the convenience store for gas. He was playing a video game in a corner of the store when one of three gunmen yelled for everyone to hit the floor, and shot the youth after he failed to respond.