Sorry for your loss. Yes, you'd be considered as Widowed. Because as per CRA, "Widowed” means that you had a spouse or common-law partner who is now deceased".
You were deemed Single if:
- You’re not currently married and have never been married.
- You were living common-law but you’ve been living apart from your partner for at least 90 consecutive days due to a breakdown in the relationship. There are no tax implications whether you choose “Separated” or “Single” after the breakup of a common-law relationship.
For more details, please follow the link by CRA.
Also, here read the TurboTax FAQ.
Thanks