The 23 year started his playing career at Milwall befoire a series of moves led him to play in Scotland.
Mbulu joined Crewe from Scottish Premiership side Motherwell on a short term contract in October 2019.
The Central Defender made seven appearances in an Alex shirt before he moved to Morecambe in January transfer window this year.
Crewe Alexandra Manager David Artell said:
Christian was no different. 23, is no age at all. He was a terrific guy. He was full of life, always smiling and an all-round great guy with good morals. That’s what makes it even worse
Police were called to an address in Preston whereby they confirmed a body had been found.
A Lancashire Police spokesperson said:
We were called at around 1.30pm today (May 26) to an address on Greenfinch Avenue, Cottam, to reports of a sudden death.
The death of the popular 23 year old player is not being treated as suspicious.