David Weir has bolstered his attacking options with the signing of Marlon King on a deal until the end of the season.
The 33-year-old joins the Blades after leaving Birmingham City by mutual consent in August.
King started his career at Dulwich Hamlet, before becoming a trainee at Barnet. After making over 50 first-team appearances for Barnet he moved to Gillingham in 2000 for a fee in excess of £250,000.
The prolific London-born striker left Priestfield to join Nottingham Forest in 2003 for a fee of £950,000, scoring 15 times in 57 appearances during his time at the City Ground.
A short loan spell with Leeds followed, before a prolific temporary stint with Watford saw the Hornets eventual pay £500,000 to secure his services permanently in December 2005.
Just over two years later, having scored 24 times in 60 league appearances at Vicarage Road, Wigan Athletic paid £5 million to take King to the DW Stadium.
During his time with the Latics, the marksman had further loan spells with Hull City and Middlesbrough, prior to joining Coventry City on a free transfer in September 2010.
One season at the Ricoh Arena saw King net 12 goals in 24 league starts, before going on to strike 29 times in 60 starts for Birmingham City in the Championship.
In total, King is approaching 500 professional senior appearances and has scored over 150 goals in all competitions.
On sealing the signature of King, Weir says he is confident the experienced campaigner will add firepower to his side: "Marlon is vastly experienced and has scored goals throughout his career, many of which that have come in the Championship
"We have been lacking someone with his experience and knowhow and his presence will take the pressure off the younger lads, whilst giving everyone a lift.
"Marlon has recently played international football so although he hasn't played at club level this season we will be looking to introduce him as quickly as possible."