TAUNTON, Mass.— In the latest developments on the stabbing attacks in Taunton, Massachusetts, acquaintances of the suspect in the fatal stabbings are revealing details about his temperament and say they are struggling to make sense of the rampage.

Police say 28-year-old Arthur DaRosa stabbed four people, two of them fatally, and assaulted others inside a mall before he was shot and killed by an off-duty sheriff’s deputy.

Thirty-six-year-old Wendy Mason lives two doors down from the Taunton home where DaRosa grew up and where his family lives. She says DaRosa was always respectful and didn’t give any indication of struggles with mental health. She says no one will “be able to make any sense” of the rampage.

Jared Green says his older brother was friends with DaRosa. The 22-year-old Green says DaRosa was always cracking jokes but also had a temper. He says he doesn’t know why DaRosa would “do something like that.”