One of four men, charged with murdering a young mother in her city home in 2004, is still on the loose.

On Monday, city police issued a message for that man, 31-year-old Michael Tyrone Stewart:

"Turn yourself in," Chief Keith Sadler advised Stewart, because "you know we're going to find you."

Stewart is one of four men charged by city police with criminal homicide in connection with the death of Heather Marie Nunn, and he is the only one not yet in custody.

Nunn, 24, was shot to death during a robbery inside her Pearl Street home, police said, while her two young daughters, aged 8 and 6, were upstairs.

The girls were unharmed, but were the ones to discover their mother's body on the kitchen floor.

Stewart, 31, whose nickname is "Mike Murder," is described by police as a black male, about 6-feet tall, 150 pounds, with short dark hair and dark eyes.

He last lived in Columbia and the 1100 block of Fremont Street in Lancaster, police said.

Warrants have been issued for his arrest and police have received several phone calls about Stewart, but as of Monday evening he was not in custody.

Anyone with information about Stewart's whereabouts is asked to call city police at 735-3300. Callers do not have to give their names.

The other suspects, David Vasquez Jordan, 28, Lancaster Township, and Edward Leon Major, 31, and Hayward Jamar Stewart, 33, both of Lancaster, are in custody.

VIDEO: Police announce arrests in 2004 killing

Sadler credited the tenacity of the police investigators, especially Detective Nate Nickel, who worked more than five years to gather enough evidence to make the arrests.

"It was a team effort," Nickel said, explaining that over the years, investigators continued to follow up on information as it came in, until arrests could be made.

"We take these cases to heart," Nickel said, urging people to continue to call, especially if they know where Stewart can be found.

Police credited the assistance of the Lancaster County District Attorney's office and the U.S. Attorney's Office.

District Attorney Craig Stedman, who also attended the press conference with Assistant District Attorney Ryan Boop, said a decision had not been made yet whether to seek the death penalty.

Boop and Assistant U.S. Attorney Mark Miller will prosecute the case in Lancaster County Court, Stedman said.

jkelley@lnpnews.com