The Rookies (1972)

Season 2: Episode 7

Jill Danko is seriously wounded by a seemingly demented gunman while dining with her husband Mike. Later, they find out that the gunman is unable to be prosecuted in court, because he is suffering from a brain tumor which appears to be the cause of his action. The rookies take it upon themselves to prove the man is dangerous and can place society in jeopardy.