Sussex Police said that it was offering a reward of £1,000 for information leading to the arrest of a man wanted for stalking.
A reward of £500 was offered by police in June.
The force said: “Police have increased the reward for information leading to the arrest of this man to £1,000.
“Malcolm Howell, also known as John Dory, is wanted for stalking offences.
“The 53-year-old is believed to be in the Brighton and Hove area, and also has links to Portslade.
“He is described as white, about 5ft 8in, of stocky build and with mousy-coloured hair.
“He also goes by the nickname ‘Fish’.
“Anyone with knowledge of his whereabouts is asked to dial 999 or report it online, quoting serial 1342 of 26/06.
“You can also contact the independent charity Crimestoppers anonymously on 0800 555111 or report it online.”