PROSECUTORS want a longer sentence for the man who killed frail pensioner Connie Mitchell.
Career criminal Ian Hemmings robbed his 90-year-old victim in Meltham last February.
She suffered a serious head injury and died from complications in hospital almost a month later.
Hemmings - who targeted other pensioners across the country - was jailed for 16½ years for manslaughter.
But regional Crown Prosecution Service lawyers say the sentence was too lenient for a man branded "a predator who was constantly on the lookout for his next victim".
Now they have urged CPS national headquarters to appeal.
A spokeswoman at the CPS's West Yorkshire base in Leeds said: "This referral took place on February 14. We are awaiting a response."
Hemmings was jailed for 12 years for conspiracy to burgle in 1999.
This sentence was reduced to nine years on appeal.
Just weeks after attacking Mrs Mitchell Hemmings mugged two elderly victims in Hampshire.
He admitted the offences at Bradford Crown Court.
Hemmings, of no fixed address, admitted manslaughter and a string of other offences.
Mrs Mitchell's daughter, Margaret Berry, and son-in law David Berry sat solemnly in court when Hemmings was jailed last month.
Afterwards Mr Berry said: "We hope Hemmings stays in prison for a very long time.
"You will know that Hemmings received a nine-year prison sentence in 1999.
"It is my view that he should still have been in prison on that day that he killed my mother-in-law."
Mrs Mitchell, a retired dinner lady, lived on Derwent Road, Meltham.
She had been walking in the village when Hemmings pulled up alongside her in a blue Citroen AX car and grabbed her bag.
Mrs Mitchell fell, injuring her head.
She died at Huddersfield Royal Infirmary a month later.
The car used in the robbery was later found abandoned in Halifax.
Hemmings had bought it five days before the robbery, using a false name.
Hemmings apologised from the dock to Mrs Mitchell's family.
He said: "As a child I had a grandmother who I loved more than anything in this world.
"I am so sorry. I know Mrs Mitchell's family will never be able to forgive me.
"I can't imagine the heartache."
He added: "If anyone hurt my grandmother the way I treated Mrs Mitchell and the other ladies I would expect them to be locked away for ever."
But Det Supt Andy Brennan, who led the police investigation, said Hemmings had shown little contrition and his words came too late.