It is taxable income.

To enter pension and annuity Payments (1099-R)

•    Click on Federal Taxes
•    Click on Wages and Income
•    Click on I'll choose what I work on (if shown)
•    Scroll down to Retirement Plans and Social Security
•    On IRA, 401(k), Pension Plan Withdrawals (1099-R), click the start or update button

Sorry for your loss.