Charles T. Sinclair, suspected as the "coin shop killer" in a string of slayings in several states and an attempted murder in the Salt Lake area died Tuesday in his jail cell of an apparent heart attack, state corrections officials said.

Sinclair, 44, suffered a heart attack at 5:43 a.m. in his cell in B-block at Cook Inlet Pre-Trial Facility in Anchorage, said Alaska Corrections Commissioner Susan Humphrey-Barnett. He had had heart problems in the past, she said.He was charged with attempted murder and aggravated robbery in the May 4 robbery of Legacy Rare Coins in Murray. Store employee Kelly Finnegan was shot in the head with a .22-caliber pistol in the robbery, court documents said.

Sinclair was wanted by police in Billings, Mont., on two counts of homicide and one count of armed robbery. He was suspected of killing coin-shop workers Charles Sparboe and Catherine Newstrom in July.

Sinclair also was a suspect in the killings of coin-shop owners in Everett and Spokane, Wash.; Vacaville, Calif., and Kansas City, Mo.

After finding him unconscious, jail personnel tried to resuscitate Sinclair but he was pronounced dead at Humana Hospital Alaska 25 minutes later after being taken there by city paramedics, Humphrey-Barnett said.