A police officer is offering a reward after a memorial honouring one of his colleagues was vandalised.
The memorial stone was unveiled in front of a crowd of 400 people
Pc Ged Walker died in January 2003 after he was dragged along a Nottingham road as he tried to arrest a thief in a stolen car.
The memorial, in Bulwell was attacked with a hammer on Tuesday, police said.
His former colleague Inspector Andy Gamlin is offering £250 of his own money for information on who has defaced the memorial.
Insp Gamlin said whoever damaged the memorial was "despicable and inhumane".
"The people who defaced the memorial caused more than criminal damage - it was an affront to society and an insult to the honour of a brave policeman."
The memorial at the junction of St Albans and Cantrell Roads in Bulwell was unveiled in front of 400 people in September 2005.
Former drug addict David Parfitt from Nottingham was jailed in 2003 for 13 years for Pc Walker's manslaughter.
Inspector Gamlin called on members of the community to contribute to the reward fund, adding that Pc Walker's family was "appalled and distressed" by the vandalism.