Martin Corns has been given a life sentence for murdering his colleague Heather Jordan after she rejected his romantic advances.
The pair became friends during their time working together but Corns was seeking a romantic relationship with 34-year-old Heather.
He became obsessive and controlling, often messaging her up to 100 times a day.
Heather was strangled to death in Lyngford Park in the early hours of Sunday 18 February while walking to work.
CCTV footage shows that the 52-year-old disposed of incriminating items, including his hoodie and mobile phone, by a railway line.
He bombarded Heather with thousands of text messages and letters, in which he dictated the rules of their friendship and professed his love for her.
In the messages he outlined the amount of time they should spend together and how quickly she had to respond to him.
Corns admitted to the Jury that he used to watch Heather’s home in Taunton and ask her to come out to the street to prove she was there.
He has been prisoned for life and will serve a minimum of 17 years.