Original sentence: In 2001, his son David murdered five people with his vehicle in the 2001 Isla Vista killings and walked free in 2012 (after serving around 10 years in a mental institution)
Edited sentence: In 2001, his son David murdered five people with his vehicle in the 2001 Isla Vista killings and walked free in 2012 (after serving only around 10 years in a mental institution for killing five individuals)