Unforgotten season 4 ending explained
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DEAN WAS THE CULPRIT Cassie spoke about looking into how Dean's (Andy Nyman) brother, Stephen, had died and this presented Sunny with the motive for him wanting to see Matthew dead.
Dean had changed his name from Quinn to Barton so he could escape the connection with his criminal family. His brother had been very supportive of his career as an officer and gave him an
engraved pen as a congratulatory present. However, Stephen had been killed by rival gang member Matthew and so when Dean found him lying unconscious in the allotment, he stabbed the fountain
pen through his head wound. They were able to find the last missing piece of the puzzle when the team tracked down the pen's maker and looked into purchasing records, finding the
connection with both Stephen and Dean.