The 45-year-old suspect was detained by detectives investigating the murder of Kevin Kearney.
Mr. Kearney was shot dead and his body dumped in a lake at Alexandra Park.
Dissident republicans claimed they carried out the killing.
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Detectives investigating the murder of Kevin Kearney at Alexandra Park in north Belfast last Tuesday have arrested a 45 year old man.
— PSNIBelfast (@PSNIBelfast) October 14, 2013