Kolkata: West Bengal Chief Minister Mamata Banerjee Friday lost her cool when asked about her once trusted aide and Trinamool Congress general secretary Mukul Roy.

Addressing the media after the budget for 2015-16 was presented in the state assembly, Banerjee walked out of the venue the moment Roy's name was mentioned.

"Please this is about state budget... don't behave like this," snapped Banerjee while the journalist had not even finished his question, managing only to utter "Mukul Roy".

"This is about budget... why (bring) other things. If you do like this, I will not come then," she said, walking away from the press corner at the state assembly.

Roy's relationship with Banerjee and the Trinamool nosedived after he was grilled by the Central Bureau of Investigation in connection with the multi-crore rupee Saradha scam in which several of the state's ruling party leaders have been arrested or interrogated.