A spokesman for Essex Police said:
"Evidence from fire scientists has indicated that the likely cause of the fire was malicious ignition.
"Detectives know that there was a burglary at the house on the same evening/early morning of the fire and are re-appealing for information and witnesses."
More top news
Oliver Dearlove died 24 hours after receiving the fatal blow outside Morden's wine bar in Blackheath last summer.
She was found in Tadworth in Surrey and is so young the RSPCA can't work out what breed she is.
Unemployed plasterer Trevor Timon had been cleared of Oliver Dearlove's murder but admitted manslaughter.