Get your taxes done using TurboTax

No.  A spouse is never a dependent.  You just file a Joint tax return.  You can file a Joint return the year your spouse died.  For the next two years following a husband's or wife's death, the surviving spouse can file as a qualifying widow or widower if they have a qualifying child. That basically lets you continue to use the same tax brackets that apply to married-filing-jointly returns.  After the year of death if you don't have a child you file as Single.