Income tax of deceased person

Sir with due respect I want to know that my husband was suffering with major heart attack for the asstt year 2018-19 and due to his illness he could not filed his return of income tax and received a notice from income tax department to show source of cash deposit in bank for Rs 70-00 Lac and in response to notice under section 148 he has filed his return under section 44 AD by showing profit more than 8% after that the case of the my husband was fixed for secrutiny under section 142(1) for 19/01/2022,but unfortunately on today i.e 15/01/2022 my husband has been expired.Now I want to know what can I do because none of the family members alongwith me not known about the business of my husband.He was the sole proprietorship of the firm.Please guide me Thanks.