Police discover a beloved teacher stabbed and beaten to death and turn to those who knew her best. The truth proves more tragic than anyone could believe. A movie-style murder plot leads investigators to a killer.

A man finds his girlfriend strangled in a bedroom closet and becomes the main person of interest; a mother and daughter face accusations after someone kills a man in the most horrific way.

A woman calls 911 after she finds her mother dead with a knife in her chest; is she a grieving daughter? Then, someone murders a husband in a remote park on Valentine's Day; is it a tragic accident or a lover's tryst gone wrong?

A husband finds his wife slain and calls 911, does he know more than he lets on?; CCTV exposes secrecy and lies; next, after a man dies falling down the stairs, police listen closely to the 911 call.

A woman vanishes, and her husband calls 911. Months later, police find her badly beaten body and make him suspect No. 1. A strange noise in the background of a 911 call leads police to the true killer.

 A daughter frantically calls 911 after gunmen tie her up and shoot her parents at home. Does she know more than she lets on? A burglar brings shocking new information to a man's supposed natural death.

 A couple finds their friend shot dead and calls 911. Is one of them more foe than friend? Police uncover a trail of deceit.