On January 19, 2014, Donna Muller, 49, and her 22-year-old son Richard were found shot to death inside their Lawncrest home on the 300 block of Stevens Street in Philadelphia. Both had been shot in the head; Richard was discovered in a second-floor bedroom and Donna was found in the hallway. Paramedics pronounced them dead at the scene after Philadelphia officers responded around 3:20 p.m. The daughter discovered the bodies when she returned to the residence.

Investigators initially considered the possibility of a residential robbery, but there were no signs of forced entry and the home did not appear ransacked, leaving motive unclear. Donna worked as a senior editor at a technology and information services company; Richard was a recent graduate who planned to continue his education at Temple University.

If anyone in Lawncrest at the time remembers unusual activity or has information about Donna or Richard’s last day, please come forward.