Mark Harrison Sheer, age 55

Lost to gun violence on May 26, 2014 in Mission Viejo, California.

Photo sources:

• May 28: EveryJoe: Teen Girl Died in Mission Viejo Murders

News sources:

• latimes.com: Family identified in Mission Viejo murder-suicide
• OC Weekly: Michael Sheer, 21, Suspected of Having Fatally Shot His Father, Mother, Sister and Self: Update
• ABC7 Los Angeles: 4 bodies discovered in Mission Viejo home
• Gun Violence Archive

Also killed were:

• Amy Joanne Sheer, age 15
• Lynda Ann Sheer, age 54

Other nearby fatal shootings:

• Mission Viejo, CA - March 21, 2023
• Mission Viejo, CA - October 31, 2014
• Mission Viejo, CA - November 25, 2005
• Mission Viejo, CA - July 29, 2002