On February 21, 2006, police found five people shot to death in a rented home in the gated Barrington Estates community in Mesa, Arizona. Among the victims was Steven Terence Duffy II, 30. The other victims were his 18-year-old brother Shane Duffy, Steven’s girlfriend Tammy Lovell, 32, and Lovell’s children Cassandra, 15, and Jacob, 10.

Investigators focused on Scottsdale business owner William Craig Miller after learning Steven Duffy and Tammy Lovell had been cooperating with police in a probe of an alleged November 2005 arson at Miller’s Scottsdale home. Steven and Tammy had worked as informants and reportedly recorded statements by Miller about the fire. Prosecutors say the slayings were carried out to prevent their testimony; evidence introduced at trial included attempts to hire assassins and charges of burglary and solicitation of murder.

A jury convicted Miller on five counts of first-degree murder and related charges, and he was sentenced to death. Does anyone have information about Steven, his family, or their time in Mesa that could shed more light on the days before February 21, 2006?