FORENSICS officers are examining a window near to where a man was found dead.
The News understands the Portsmouth man, 28, fell from the first floor window in Outram Road, Southsea.
A shocked resident discovered his body at around 8am yesterday.
Police have arrested another man, also 28, on suspicion of murder.
Firefighters from Southsea station have used their aerial ladder platform to allow crime scene investigators access to the window.
Detectives yesterday said the man remained in custody.