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BERKS COUNTY, Pa.– The killer in a murder-suicide that took the lives of a family of five in Berks County, Pennsylvania, has been identified as the father, District Attorney John Adams said Monday.

Mark Short, 40, killed his 33-year-old wife, Megan, and the couple’s three children, 8-year-old Liana, 5-year-old Mark Jr., and 2-year-old Willow.

Willow was a heart transplant survivor whose story made national headlines.

Police found their bodies in their Sinking Springs home on August 6 dead from gunshot wounds, along with the family dog. Mark Short left a note admitting to buying a gun and killing his family, Adams said at a news conference. The note was likely written after Short killed his family.

Megan Short’s mother called Sinking Spring Police after her daughter missed a lunch date.

The couple had domestic and marital problems and were in the process of separating, Adams said.

A few weeks before her death, Megan Short called 911 after an argument and said she was afraid of her husband, authorities said.

Police say Mark Short had bought the gun just one day after police responded to a domestic dispute call. The shootings took place a few weeks later.

CBS Philly reports that, according to officials, Mark Short took his children to Hershey Park just a day before the murder-suicide.

**Watch a past report in the video above**