The skull has been set in a tonne of mud in an area cordoned off with crime scene tape as three forensic scientists studied the area.
The channel will also have new idents created by Art&Graft, which reflect the puzzle-solving nature of the programmes and show red string across different rooms, for example in an empty bank.
The idents were created by Mike Moloney and William Mercer at Art&Graft, and Scott Russell at UKTV.
The Alibi logo has a new typeface and colour.
Adrian Wills, the general manager at UKTV for Alibi, said: "We launched the channel six years ago and it’s established itself as a loved destination for fans of crime drama, with an enviable mix of high quality British and US content.
"It is now the right time to mark the next stage in Alibi’s evolution by infusing its brand identity with a contemporary edge to reflect its high quality output."