A fourth man has been arrested in connection with the killing of church organist Alan Greaves on Christmas Eve.
The lay preacher was making his way to Midnight Mass at St Saviour's Church, near his home in High Green, Sheffield, when he was attacked.
A 22-year-old man was arrested in Parson Cross, Sheffield, on suspicion of Mr Greaves' murder, South Yorkshire Police said.
It follows the arrest of a 21-year-old man from the High Green area of Sheffield on Tuesday night. He remains in custody.
Two other men, one in his 20s and one in his 40s, were arrested last month and have been bailed pending further inquiries.
Police said the arrest came thanks to the public response to an appeal on Monday, when they released CCTV footage of two men filmed just before Mr Greaves, a 68-year-old grandfather, was attacked as he went to the church a few hundred yards from his home.
The father-of-four died from severe head injuries three days later.
More than 50 police officers have been working on the case but detectives have been unable to establish a motive for the killing.
Independent charity Crimestoppers has put up a £10,000 reward to help find those responsible for his death.
At a memorial service after her husband's death, Mr Greaves' widow Maureen said she had wept over the "evil that has been done" .