BERLIN (AP) — A lawmaker with German Chancellor Angela Merkel's party has died after collapsing on a plane during a flight home to Germany.

Karin Strenz, 53, was flying back from Cuba with her husband, said Eckhardt Rehberg, a fellow lawmaker with their center-right Christian Democratic Union party, according to news agency dpa.

The plane made an emergency landing in Ireland, but rescuers were unable to save Strenz, Rehberg said late Sunday. It was unclear what the cause of death was or why she had traveled to Cuba.

Strenz had been a member of the German parliament since 2009, representing a constituency in the northeastern state of Mecklenburg-Western Pomerania.

She didn't plan to seek re-election in Germany's Sept. 26 election. Early last year, Strenz and another lawmaker were targeted in raids by prosecutors investigating alleged money transfers from Azerbaijan.