A million dollars is being offered for information that will help resolve the mysterious murder of Bernd Lehmann in Sydney more than 13 years ago.
The body of the 66-year-old German was found inside a home unit at Alt Street, Ashfield, about 7pm on Valentine's Day on 2008.
A post mortem examination revealed he died from severe head injuries.
Strike Force Navala, comprised of detectives from Burwood Police Area Command and the State Crime Command's Homicide Squad, was formed to investigate his death but no arrests have been made.
Following a coronial inquest in 2012, the matter was referred to the Unsolved Homicide Unit.
Police will announce a $1m reward on Thursday as they renew their appeal to the community to come forward with any information that could resolve the case.
Mr Lehmann's family previously pleaded for help to solve his murder in 2009.
