Police arrested the third man in Manchester
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A fourth man has been arrested after a teenager was found dead with a gunshot wound to the head.
The body of 18-year-old Daniel Higgins, from West Drayton in Middlesex, was found in a house in Burnham, near Slough.
All four men so far arrested on suspicion of murder are in their 20s and from Slough.
Earlier on Tuesday, a third arrest in the Thames Valley Police murder inquiry was made in Manchester.
The man has been brought back to Berkshire for questioning by detectives, who have renewed their appeal for anyone with information to come forward.
Mr Higgins' body was found in the early hours of Sunday in a house in Thirlmere Avenue.
A post-mortem examination at Wexham Park Hospital in Slough, Berkshire, concluded that he had died from a single gunshot wound to the head.