Prosecutor Kathy-Ann Pyke on Thursday threatened to sue attorney Hugh Wildman over alleged defamation of character while the defence lawyer was conducting cross-examination of a witness in the murder trial of six policemen.

The witness, a retired forensic analyst, was being grilled by Wildman on whether or not she had discussions with Pyke in the corridors of the Supreme Court earlier this week before she began to testify about swabs she tested for gunpowder residue.

She was giving her testimony in relation to the January 12, 2013 shooting deaths of Matthew Lee, Ucliffe Dyer and Mark Allen. The men were killed by the police in an alleged shootout on Acadia Drive in Barbican, St Andrew.