A Deadly Victim

When two vagrants come across an attempted hit, and one of them is killed. The other calls Dan. When Dan goes to the place and asks Nelson to meet him and there are no signs of a hit. Dan then sees the vagrant; an old friend. Dan believes her and sets out to prove it. Later some men tell Dan to back off which he doesn't. Dan learns that the government may be involved. And the hit men set out to find her.