A man has been jailed for life for murdering his nine-year-old grandson by drowning him in the bath.
Stewart Greene, 65, of Danes Court, Grimoldby, Lincolnshire, was told he will face a minimum term of 22 years in prison.
Sentencing Greene at Lincoln Crown Court, Judge Mrs Justice Thirlwall Dee said: "The callousness cannot be overstated."
Greene was accused of killing Alex Robinson at the boy's home two days before Christmas.
He had denied the charge but changed his plea on Thursday morning.
The court had heard that Mr Greene was looking after the youngster while his mother went out to buy a turkey.
Prosecuting, Michael Evans QC told the court Greene was left alone with Alex on the morning of December 23 last year.
He said the youngster, who was on the autistic spectrum, had been playing on his Xbox when his mother, Joanne Greene, left to go to Tesco.
Mr Evans said Ms Greene returned to find her father sitting calmly on the settee.
According to the prosecutor, Greene told his daughter: "I've drowned Alex in the bath."