He reported that Flores discovered his father had been cheating on his mother, and was upset with his mother that she had not left him.
The report says that once Flores Semyonov finished college, he moved back in with his parents and his lifestyle changed “completely.”
The family member told authorities that Flores Semyonov stopped drinking alcohol and began making vague, threatening comments, such as “you’ll get what’s coming to you,” documents detail.
Family members reportedly noticed Flores Semyonov stopped socializing and was diagnosed with an unknown mental health condition, redacted in the police report.
However, one account described an incident where Flores Semyonov’s mother reportedly found him watering plants in the middle of the night because “the plants told me [Matthew] they were thirsty,” documents state.