The funeral has taken place in Arklow of James Sheehan.
His body was found in the Avoca River last week.
Hundreds of volunteers joined in the search for the 18-year-old.
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He disappeared after a night in a club with his friends on Saturday August 18th.
His body was eventually found last Thursday by a volunteer diver.
Gardaí said on Friday they were not treating his death as suspicious.
A post mortem carried out on the remains of the teenager found he died of natural causes.
The mass took place at St. Mary and Peter Church in Arklow this morning.