Which Bollywood actor/ actresses had a promising career but ruined it with bad decisions?

• Rajpal Yadav: Rajpal Yadav is synonymous with humorous acting. He was born in a simple house hold but always wanted to be an actor.

• Training: Well, he has gone through a diploma course in acting from famous Bharatendu Natya Academy in Lucknow, Uttarpradesh. He also studied drama at prestigious national school of drama.

• Praise: He has won acclaim through his talent in various movies-Jungle (screen award for a negative role); Road;Chandani Bar;Mujshe Shaadi Karogi etc
  [1]

• Imprisoned: For reasons best known to him; he got involved in a financial fraud case and spent ten days in prison. 
  [2]
• Then, he was further sentenced to spend three months in prison by respective court.
  [3]
   Undoubtedly, it ruined his good image and career .
• Pic credits: Google

Disclaimer:

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Footnotes

[1] 

Rajpal Yadav - IMDb

[2] 

Rajpal Yadav after his jail term: People misused my trust

[3] 

Actor Rajpal Yadav sentenced to three months in jail in Rs 5 crore recovery suit