No, the last OEM diesel Burb was model year 1999.
There are several companies that do conversions - DuraBurb is one. They graft a Duramax/Allison powertrain into a 2500 Burb. Upside is huge increase in towing power and an OEM look with everything working as it should. Downside is a loss of payload capacity due to the added weight of the engine and transmission.