Prosecutors have charged him with second-degree murder and criminal possession of a weapon.
San Francisco's universities are yet one more place for older singles to meet up.
San Francisco State University has an Osher Lifelong Learning Institute.
reports, 42-year-old David Haigh of Pennsylvania went to Brooklyn to meet 41-year-old James Johnson.
The consensual encounter in April took a deadly turn and left Johnson fatally stabbed.
Fast-forward 40 years: Social mores have changed, but San Francisco still reigns as a bastion of active dating across all demographics.