[goatsi]

The strongest evidence I have seen is that the developer was arrested by the DEA on unrelated charges.[0]

The full story about him is fascinating and well worth the read.[1]

[0] http://www.newyorker.com/news/news-desk/the-strange-origins-...

[1] https://mastermind.atavist.com/

[acqq]

It's not a developer of TrueCrypt but of E4M. At the time TrueCrypt was developed Le Roux was busy with doing crimes.

https://en.wikipedia.org/wiki/E4M

https://en.wikipedia.org/wiki/Paul_Le_Roux

Although TrueCrypt existed since 2004 he ordered his employees around 2007 to use E4M (which would be improbable if he really developed TrueCrypt). The developer (or developers) of TrueCrypt isn't publicly known.