Stanford is the gardener of the Sinclair Mansion. He had an affair with Anna Sinclair, the daughter of his employer Lord Sinclair, but when the relationship ended, she tried to have him fired by destroying the flowers in the garden. Their relationship has continued to be sour since. He has a shed in the garden which contains flypaper.
When Lord Sinclair was murdered, he was convinced Anna was the killer. When Anna was arrested and put on trial, he was called as a witness, where he claimed she didn't use her poison for her chore but couldn't provide any concrete evidence that she was the killer.
^Gossip, "Murder Mystery", RuneScape. "Anna... ah yes... Anna has 2 great loves: Sewing and gardening. But one thing she has kept secret is that she once had an affair with Stanford the gardener, and tried to get him fired when they broke up by killing all of the flowers in the garden."
^ abStanford, "Murder Mystery", RuneScape. "It was Anna. She is seriously unbalanced. She trashed the garden once then tried to blame it on me! I bet it was her."
^Mary, "Murder Mystery", RuneScape. "She really doesn't get on well with Stanford, I really have no idea why."