The ashes of murdered baby, Deidre Kennedy, have been stolen from a home in the Lockyer Valley, west of Brisbane.

Deidre Kennedy was killed in Ipswich in 1973 when she was 16 months old.

Her body was found on the roof of a toilet block in Ipswich.

She had been sexually assaulted and strangled to death.

Police say her ashes were stolen from a home at Laidley yesterday.

They are appealing to the public for information.

The baby's mother, Faye Kennedy, has long campaigned to change Queensland's double jeopardy laws after a court ruled the man accused of killing her daughter could not be re-tried.

Raymond John Carroll was twice found guilty of offences in relation to her death but had them quashed on appeal.