After party chief Joerg Haider died in an accident in October, Stefan Petzner became its new leader.
But Petzner stepped down one month later after he described Haider as "the man of my life," raising speculation of a gay relationship.
Herbert Scheibner was then named interim party chief until a new leader was picked.
Bucher, who is considered a pragmatist, headed the party's parliament group after legislative elections last year. The alliance won nearly 11 percent of votes in the polls, making it the fourth largest party with 21 seats.
An investigation into 58-year-old Haider's death has shown that the controversial politician, who was married, had drunk too much while at a gay club before getting behind the wheel and crashing early on October 11.
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But Petzner stepped down one month later after he described Haider as "the man of my life," raising speculation of a gay relationship.
Herbert Scheibner was then named interim party chief until a new leader was picked.
Bucher, who is considered a pragmatist, headed the party's parliament group after legislative elections last year. The alliance won nearly 11 percent of votes in the polls, making it the fourth largest party with 21 seats.
An investigation into 58-year-old Haider's death has shown that the controversial politician, who was married, had drunk too much while at a gay club before getting behind the wheel and crashing early on October 11.
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