CHESTER, Pa. (CBS) - Two men have been charged with a double murder in Chester over the last Labor Day weekend.

Authorities say the case was broken in large part because witnesses stepped up.  And that’s a changing trend in this crime-ridden town that officials are glad to see.

Brian (“Itchy”) Selby, 40, surrendered  to police on Tuesday night.  He, along with Jujuan (“Apples”) Parker, 21, who has been in custody since December, are charged with gunning down 27-year-old Tyrone Thompson and his 19-year-old nephew, Jeffrey Joyner Jr.

Delaware County DA Mike Green won’t discuss a motive at this point, but credits the cooperation of three witnesses.  And he says it’s part of a trend here.

“Men and women are reporting information that they learn as they learn it, and supporting our police department, the mayor, and the general good of every person who lives here,” Green told reporters today.

To that end, Green says, detectives are close to breaking four other unsolved murders in Chester they think were committed by the same person or gang.  The hope is, if others step up, they can start to close them as well.

Reported by David Madden, KYW Newsradio 1060.