... (Fab. 14 and 135): these sections of Hyginus treat Laocoon and his demise

14.17 Laocoön listed among Jason's' Argonauts
Laocoon of Calydon, the son of Porthaon and brother of Oeneus.


135. Laocoon. Laocoon was the son of Acoetis and brother of Anchises. A priest of Apollo. When he had taken a wife against the wishes of Apollo and had begotten sons, he was selected by lot to make an offering to Neptune on the seashore. Apollo saw an opportune moment and sent two sea-serpents from Tenedos through the waves to kill Laocoon's sons Antiphas and Thymbraeus. When Laocoon tried to rescue them, the serpents entwined him and killed him too. The Trojans thought this all occured because Laocoon rifled a spear at the Trojan Horse.
  —trans. RTM


Hyg. Fab., 14.17, 135:  
  14.17 Argonautae. Laocoon Porthaonis filius, Oenei frater, Calydonius. ...
   135. Laocoon. Laocoon †Acoetis filius Anchisae frater Apollinis sacerdos contra uoluntatem Apollinis cum uxorem duxisset atque liberos procreasset, sorte ductus ut sacrum faceret Neptuno ad litus. (2) Apollo occasione data a Tenedo per fluctus maris dracones misit duos qui filios eius Antiphantem et Thymbraeum necarent, quibus Laocoon cum auxilium ferre uellet ipsum quoque nexum necauerunt. (3) quod Phryges idcirco factum putarunt quod Laocoon hastam in equum Troianum miserit.