merseyside police
The killer died on Monday.
Steven was last seen by his mother in 1992.
Walmsley was serving life for the murder of Anthony Duffy.
Walmsley was transported to hospital by taxi.
Merseyside Police launch manhunt.
The body was found on Thursday evening.
The boys were just 11-years-old.
Their pet dog was also found dead at the scene.
A 42-year-old man has been arrested.