Andrew Mittal was Joan Watson's ex-boyfriend. He was a software engineer who lived in Watson's building.
|Watson meets Andrew when he was living in his brother's apartment near to Watson's. He misplaced his brother's lizard which Watson helped him find. He asked how he could repay her and she gave him her business card and left for a meeting. ("Enough Nemesis To Go Around") Andrew meets Holmes at Joan's as he is coming out of the bathroom with no pants on. Sherlock comments that Watson appears adequately sexed by him. ("Just a Regular Irregular")
|When investigating an AI case, Holmes asks for Andrew's help which puts him in contact with many intelligent computer types. Watson thinks Holmes is trying to find out about Andrew but he claims innocence. This puts Andrew in contact with a future business partner that requires him to spend significant time in Denmark, much to Watson's disappointment. However, she surprises him by flying to Denmark with him to spend the first few days of his trip there with him. ("Bella") When Andrew returned from Denmark, Watson had dinner with Andrew and his father Santhosh which went perfectly but made her realize that she didn't want a conventional relationship. Days later, she invited Andrew to a coffee shop to break up with him. Andrew accidentally drank Joan's coffee that was poisoned with hemlock by an assassin hired by Elana Marsh and died. ("Hemlock")|
- IMDb incorrectly lists the character name as Andrew Paek.