The new year has brought a shocking string of mass killings in the U.S. — six in less than three weeks, accounting for 39 deaths.

Mass killing defined as four dead not including the offender.

Three have occurred in California since Jan. 16.

Authorities identified six people - including a 16-year-old mother and her 10-month-old baby - who were killed in a shooting last week at a home in central California.

72-year-old Rosa Parraz
52-year-old Eladio Parraz Jr.
50-year-old Jennifer Analla
19-year-old Marcos Parraz
16-year-old Alissa Parraz
10-month-old Nycholas Parraz