Court documents from December 2008 show Jordan Lee Degroot was sentenced to four years in prison for another random attack in a Downtown Eastside hotel in the summer of 2008.
Degroot, now 39, beat a man with a club so badly the victim suffered brain damage. The two men had never met before the attack.
During sentencing in 2008, the judge noted Degroot had one previous conviction for punching a woman in the face earlier that year. Again, the two had never met.
The judge called the cases double tragedies. He described Degroot as a highly intelligent, gifted man with a master's degree in Environmental Science and a good job.
But the judge wrote Degroot had been in a downward spiral since 2004 because of medical problems and mental health issues.
On Tuesday, Degroot made a brief first court appearance for Sunday's West End stabbing. He said nothing during his one-minute appearance and he does not yet have a lawyer.
Degroot will be back in court next week for a bail hearing.