Gangsters have placed a £250,000 bounty on Olivia Pratt-Korbel's killer amid fears that he will 'grass' fellow gang members to lighten his sentence, it has been reported tonight. 

Thomas Cashman, 34, shot Olivia dead in August last year at their home in Dovecot, Liverpool. He had been aiming at drug dealer Joseph Nee, 36, who had run into the building moments earlier. 

Cashman, who has reportedly been linked to three other unsolved murders, faces life imprisonment when he is sentenced tomorrow for Olivia's death.

A gang insider told The Sun that a bounty to 'silence him' was issued and has already been circulating in the north and around jails. 

The source added that there are several people 'who will not think twice about carrying it out'.

Drug bosses have placed a £250,000 bounty on murderer Thomas Cashman, 34, (pictured). He shot and killed nine-year-old Olivia Pratt-Korbel last August 

Those who ordered the hit are understood to worry that Cashman will turn over information about gang executions and unsolved murders in an attempt to improve the terms of his imprisonment.

There is concern his testimony would cause a 'world of pain' for several big organised crime bosses who 'do not want their activities being looked at.'

'He has nothing to lose — he is cornered,' the source told The Sun. 'There's lifers who will be mixing with him in months and years to come who will not think twice about carrying it out.'

The insider added that Cashman 'knows everything there is to know about organised crime, drugs and violence' in Merseyside. 

The convicted killer claimed in court that he was only a cannabis dealer, but was allegedly known as a hitman who 'thought nothing of putting a bullet in someone'.

Gang bosses issued a £250,000 bounty to 'silence him' amid fears that Cashman (pictured in a court sketch on Thursday after the verdicts were read) will 'grass' fellow criminals. News of the bounty has already been circulating in the north and around jails