The calm of night was shattered Tuesday when 50-year old Pam Mullins was murdered as she rode her bicycle on Sacramento Street. Police received a 911 call about a woman down around 11:36 pm on Dec. 4 and arrived to find Mullins, an in-home health worker, lying on the ground with a shot to her head. She was just yards from the apartment she had moved into a few weeks before. Her family set up a public memorial of balloons, a teddy bear, and tea lights spelling out her name. It was Berkeley’s fourth homicide of the year.