Robin Williams left behind four unfinished films

Robin Williams had finished filming a third film in the Night at the Museum series alongside Ben Stiller.

A prolific actor throughout his illustrious career, Robin Williams had a number of movie projects at different stages of development at the time of his tragic death.

The 63-year-old actor had recently completed several films, including a third movie in the Night At The Museum series, which will undoubtedly have heightened interest in them following his sad demise.

Other projects, such as a mooted sequel to the 1993 hit comedy Mrs Doubtfire, were in the early stages of development and "most likely won't go ahead," reported Variety.

Prior to his death, Williams had completed filming on Night At The Museum: Secret Of The Tomb, the Ben Stiller comedy, in which he had reprised his role as Teddy Roosevelt for the third time. It is due to hit cinemas in December.

Another seasonal release he had already completed was Merry Friggin' Christmas, co-staring Lauren Graham, Joel McHale, Candice Bergen and Oliver Platt. The holiday comedy has a US release date of November 7.

Another completed movie was the drama Boulevard, in which Williams played a devoted husband in a marriage of convenience who is forced to confront his secret life.

It had screened at the Tribeca Film Festival in June and is likely to receive a general release soon.

Another project Williams was working on was Absolutely Anything. Described as a mix of comedy and sci-fi, Williams had provided the voice for Dennis the Dog. The film stars Kate Beckinsale, Simon Pegg and Eddie Izzard.

According to IMDB, Absolutely Anything is in post-production and slated for release next year.

News of a proposed sequel to Mrs Doubtfire was announced in April, Variety reported. Although no firm decision has been made on the project, "it most likely won't go ahead".

For the second Mrs Doubtfire, writer David Berenbaum had finished a first draft of the script and reportedly met with Williams earlier this year.

Williams had also been attached to star in the indie movie A Film By Alan Stuart Eisner, but hadn't started filming.

After first making his name in television back in the late 1970s, Williams had recently returned to the small screen in the CBS show The Crazy Ones.

In the show he played a Chicago ad executive alongside former Buffy the Vampire Slayer star Sarah Michelle Gellar, but it wasn't a hit with viewers and had been cancelled in May after a single season.

- Daily Mail