South Wales police and crime commissioner said an investigation must be allowed "to take its course".
Mohamud Mohammed Hassan was arrested at home on Friday but released without charge on Saturday.
Officers were called to an address on Saturday night with the death being treated as "unexplained".
By Dafydd Morgan
Newyddion BBC Cymru
By Chris Long
By Carys Betteley
William Fellowes was sentenced 30 months in prison at Swansea Crown Court for shining the laser towards the aircraft.
By Jenny Rees
BBC Wales home affairs correspondent