A 20-year-old Louth man has been found guilty but insane for the murder of his infant nephew.

A murder trial jury has retired to consider its verdict in the case of David Brennan, the 20-year-old man accused of murdering his infant nephew.

A 20-year-old Louth man accused of the murder of his infant nephew told gardai that he had strangled the child before trussing him up with rope and dropping him off a railway bridge into the water below, the Central Criminal Court heard today.