The funeral of the off duty police officer shot dead almost three weeks ago in Clacton will take place next Tuesday.
A pensioner from Essex has been talking about his meeting with the man who gunned down a police officer in Clacton.
Retired lorry driver Ivor Starling, who lives in Weeley, met Peter Reeve about two hours after PC Dibell was shot dead.
Detectives trying to reconstruct the last moments of a gunman who killed a police officer have issued an appeal for information.
Pc Dibell, 41, was shot dead near his home in Clacton, Essex, last week. His suspected killer, Peter Reeve, 64, was found dead the following day.
Today, Essex Police said people who were in the Chelmsford area on the evening of July 9 and the morning of July 10 may hold the key to piecing together Reeve's movements.
Officers now believe Reeve was in Chelmsford at 9pm on July 9 - just five hours after a major manhunt was launched to find him.
Detective Chief Inspector Simon Parkes said: "We know Peter Reeve got a train from Colchester to Chelmsford at approximately 7.30pm on Monday, July 9, and tried to visit friends and family in the Melbourne area a couple of hours later.
We then have no further sightings until we found his body in the grounds of All Saints Church in Writtle at 8.30am the following morning. This was after a gunshot was heard.
"We need to find out how Peter Reeve got to Colchester and how he came to be in Writtle on Tuesday morning.
Anyone with information is asked to contact Colchester's major investigation team on 101 or email firstname.lastname@example.org
An inquest into the deaths of murdered Essex policeman Ian Dibell and the man believed to have shot him was opened and adjourned today.
Pc Dibell, who was 41, died after being shot while trying to intervene in a dispute near his home in Clacton on Monday.
Police launched a manhunt for sixty four year old Peter Reeve who was found lying dead in a churchyard at Writtle near Chelmsford the following morning.
The film-maker Michael Winner has revealed his charity, the Police Memorial Trust, will put up a permanent tribute to the Essex police officer who was killed on Monday.
Heartfelt tributes have been paid to Ian Dibell, the Essex police officer shot and killed in Clacton.
Friends and colleagues have been telling ITV Anglia correspondent Malcolm Robertson of their personal loss and grief.
His bravery has been praised in the House of Commons by both the Prime Minister and the leader of the opposition.
Closer to home, friends and colleagues have been telling Malcolm about their personal loss and grief.
Prime Minister David Cameron and opposition leader Ed Miliband have both paid tribute in the House of Commons to the Essex policeman Ian Dibell.
The off duty PC was shot dead as he attempted to intervene in an incident in Clacton-on-Sea.