Ritzer had worked as a math teacher in Danvers since September 2012. She graduated from Assumption College in Worcester in 2011.
In 2007 when she graduated from Andover High, Ritzer received a technology award for Excellence in TV production. Joe Spanos, the retired head of the TV production department at the high school, remembered Ritzer well.
"I cried when I heard the sad news this morning," said Spanos, who still lives in Andover and retired two years ago. "She was a great student. I taught her in my TV production class. She was a teaching assistant. She always wanted to be a teacher."