Gianni Sonvico: Police appeal in London over missing Welsh barrister
His sister Maya Sonvico has posted an appeal on YouTubeto help find him.
She said he was last seen leaving Tower Hill underground station and he told his friends he was making his way home.
Mr Sonvico, formerly of Goodwick, was wearing a black suit and purple shirt.
He was called to the bar in the summer and is a research assistant for the Law Commission in London, working on law reform projects.
He is also a former pupil of Ysgol y Preseli in Crymych. Head teacher Martin Lloyd described him as a "brilliant student and hugely likeable".
The Met has asked people with information about Mr Sonvico to call Islington CID on 07766 781 861, the police non-emergency line on 101 or Missing People on 116 000.
About to head into Middle Temple for the first time since Call. I definitely feel far more of a member than I did as a student.
— Gianni Sonvico (@GianniSonvico) October 25, 2013