The First 48 - Season 12 Episode 28 -

A brutal shooting in Memphis leaves a single mom mourning her only son. The main suspect is a high-ranking gang member. Will his violent reputation keep witnesses from testifying? Then--a Birmingham motorist calls 911 in the middle of the night after his car is run off the road. But when responders arrive, they find the caller shot dead. A lone eyewitness steps forward, but will his testimony be enough to convince a jury to convict?