A third man then also shot him, police said.

One shouldn't laugh.  But one is human.

From A man had his AR-15-style rifle stolen at gunpoint. He then used a second gun to open fire on the robber, police say. by Joshua Zitser.

The details are in the article.  And then there is this classic line. 

The victim fled with his rifle while the accused robber, who had been shot several times, remained on the scene. A third man then also shot him, police said.

This supports the argument that the police are there in part to protect criminals from mob justice.