Detectives investigating the suspected murder of a missing Polish woman have released CCTV footage of a man they urgently want to speak to.
Sylwia Ciapcinska, 24, of Ash Street, Burton-on-Trent, and was last seen shopping in the town on 20 July.
Police have released footage of a man seen pushing a case which he emptied at the nearby recycling centre in Shobnall Road at about 1330 BST on 21 July.
Anyone at Burton Recycling Centre at that time is asked to call police.
Ms Ciapcinska, a qualified teacher who graduated with a master's degree in psychology, arrived in the UK on 2 July to work for a distribution firm called Amethyst Logistics based at Fradley Park, near Lichfield.
She was planning to stay in the UK for up to 12 months, earning money to help her save for a deposit on a house in Poland, Staffordshire Police said.
Her body has never been found and her suitcase is missing from her address in Ash Street.
The man in the CCTV footage is seen pulling, then pushing, a dark trolley or case into the tip, before emptying its contents into a skip and walking out.
Ch Insp Selwyn Burton said: "Detectives from our major investigation department need to speak to this man so that he can be eliminated from our inquiries.
"It is not clear whether he lived nearby and walked to the recycling site or arrived in a vehicle too big to enter the tip and parked outside."
Thomasz Sobczak, of Ash Street, Burton-on-Trent, has been charged with murder. The 29-year-old is due to appear in court on 8 October.