There were stories that his 'girlfriend' had dumped him.
Maybe he had a 'thing' for his psychiatrist, and your 'wild guess' falls in line.
He was being thrown out of his apartment, he had no job, and his 'girlfriend' psychiatrist 'dumps' him (let's him know she's not interested) and then goes on vacation.
This shrink is in the hot seat and her taxpayer funded university is going to do its best, spending millions to shield her and obfuscate any connections between her and the mass murderer