Friends came together on Tuesday afternoon for a vigil in north Scottsdale to remember the 15-year-old girl who was killed in a murder-suicide last week. Sophia Lonergan and her mother, Lisa, were found shot to death in the backyard of their Scottsdale home off Indian Bend Road and Via De La Sendero. Friends and classmates who showed up Tuesday painted rocks with Sophia and her mom’s initials. Jason Barry reports…