@Members_E6hQMsG: I'm sorry to hear of your loss. If you know the details of the Samsung account that is registered to the tablet, then you may wish to try Find My Mobile to see if you're able to remotely unlock the device from here.
https://findmymobile.samsung.com
Alternatively, if you have proof of purchase then you can visit a Samsung Experience Store or Support Centre near you, and an engineer can unlock the device for you. To find your nearest one please follow the link below, select 'Mobile Device > Phones, tablets and wearables' and enter your post code.
