A woman has told a murder trial a letter was sent to her home claiming that radio presenter Nasim Jamil had been killed by three men.
Isobel Trainer, 50, from Clydebank, near Glasgow, told the court the contents of the letter were "horrific".
The letter was sent to Christopher Miller, at the home of Ms Trainer, who the jury heard regarded him as a son.
Khalid Sarwar denies murdering 54-year-old Nasim Jamil at her home in Byres Road, Glasgow, in December 2009.
Ms Trainer told prosecutor Dorothy Bain QC that after reading the contents of the letter - which claims Mr Sarwar was innocent and three men were responsible for the murder - she handed it in to Clydebank police station.
The letter was read to the jury. It began: "Three people are responsible for victim's murder Safraz from Govan, Aamar from Govan and me. I don't want to identify myself."
The author of the letter claimed Safraz and Aamar had run away to Pakistan.
The person then described themselves as a coward and a murderer, and said the scene was "a bloodbath".
It said: "We are monsters that should be locked up for ever. If you don't believe me an innocent person gets sent down."
The letter said Safraz and Aamar went to Mrs Jamil's flat and were joined by the letter-writer.
It then related what it claimed were details of the Awaz FM agony aunt's murder.
It said Mr Sarwar witnessed the attack and that Safraz took a video of him holding Mrs Jamil afterwards.
The letter, which was sent at the beginning of September, also claimed the men had threatened to kill Mr Sarwar if he told anyone.
The court was told Ms Trainer gave Mr Miller the letter four weeks after it was delivered. The following day it was passed on to her by one of her sons.
In the letter the person who purports to be Mrs Jamil's killer said one of his alleged accomplices, Aamar, was a relative of the victim.
Series of drawings
On the back of the letter was a series of drawings, including one showing a kitchen with a woman lying on the floor.
Another note in different handwriting and addressed to Mr Miller was also sent, along with the alleged confession.
Mr Sarwar is accused of murdering Mrs Jamil by repeatedly striking her on the head and body with a hammer and screwdriver or similar instrument and hitting her on the head with a bottle and a piece of glass on 9 December 2009.
He is also charged with stealing three knives, a quantity of clothing, a light bulb, two phone, keys, gloves, a watch, a bracelet, a necklace, a pair of earrings, a handbag and a sum of money.
Mr Sarwar is further accused of attempting to pervert the course of justice on 11 December 2009, by giving false information to police officers.
The trial before Lord Brodie continues.