BOSTON, April 30, 2018— Two men already facing separate gun charges were arraigned today in the January shooting death of 22-year-old Alexander Mervin, Suffolk County District Attorney Daniel F. Conley said.

JERION MOORE, 19, of Stoughton and NICHOLAS SICELLON, 18, of Dorchester, were each arraigned today in Roxbury Municipal Court on a charge of murder in Mervin’s shooting death. At the request of Assistant District Attorney David Bradley of Conley’s Homicide Unit, Judge Kenneth Fiandaca ordered both men held without bail.

At approximately 1:45 p.m. on Jan. 11, Boston Police responded to a ShotSpotter activation at a Whittier Street parking lot just a few hundred yards from Boston Police Headquarters. There, they encountered Mervin, who had been shot multiple times as he cleaned out his car in the parking lot. He was rushed to Boston Medical Center, where he died of his injuries.

Ballistic evidence and witness statements indicate that two assailants opened fire on Mervin. Video captured by an MBTA public safety camera captured two men later identified as Moore and Sicellon as they left the scene and entered the Shawmut Avenue home of a relative of Moore. Sicellon then summoned an Uber that took them from the area minutes later.

The two men were identified through records linking Moore to the address the men entered and through the credit card and telephone number on record with Uber, Bradley told the court.

In the weeks following Mervin’s homicide, Moore and Sicellon were each arrested separately on unrelated firearm charges. Moore was arrested Jan. 27 in Dorchester after he fled from officers investigating a man who was in Moore’s company; Moore was seen pulling a gun from his jacket pocket as he ran, prosecutors said. Sicellon was arrested in Dorchester two days later on Jan. 29 after he fled from a motor vehicle stop on foot. Officers observed him toss one firearm as he ran and a second firearm was found on his person when he was taken into custody. Both firearms had previously been reported stolen. Sicellon has remained held on $15,000 bail since his arrest; Moore was released and ordered to wear a GPS monitor after a judge reduced the $5,000 bail imposed at arraignment to $2,500 in February. He was taken into custody at his home in Stoughton on Saturday evening.

Elise McConnell is the DA’s assigned victim-witness advocate. Moore and Sicellon are represented by attorneys Michael Bourbeau and Michael Phelan. They return to court June 4th.

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All defendants are presumed innocent until and unless proven guilty beyond a reasonable doubt.