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He also played a small role in the film Highlander. He played the part of Dougal MacLeod, cousin of Connor McLeod. played a teenager in 80s cult American horror film "Slaughter High" Billy also appeared as Isaac Talentire in the original west end production of Howard Goodall's musical The Hired Man.
Hartman appeared as Dave Slade in the first programme of Series Four of Heartbeat 'Wild Thing' that was aired in the UK on 4 September 1994. He played the part of Dave Slade whose dog was savaging/killing sheep.
On 26 October 2013, Hartman played the role of Graham O'Reilly who gets in trouble after him and his son find a bag of cash in Casualty.
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