[5] He played for the Star Hotshots of the Philippine Basketball Association (PBA) from September[6][7] to October 2017 when he returned to KR.

[10] On 12 June 2018, Kristófer signed a two-year contract extension with KR with the option to leave if he received an offer from a bigger club.

[12] After struggling with ankle injuries and unhappiness with living in a mostly non-English speaking city,[13] he reached an agreement with the club to be released from contract in middle of November that year.

He further claimed that board believed that he had hid the extent of his injuries before signing a contract extension in 2019 although evidence did show that both the then head coach Ingi Þór Steinþórsson and KR's physiotherapist where aware of them.

[22] On 30 September, KR signed Kristófer's transfer papers, officially making him a Valur player.

[26] For the season he averaged 12.7 points and 7.5 rebounds and helped Valur finish 4th and secure their first playoff seat since 1992.

[29] He won the national championship in 2024 but suffered a knee injury 20 seconds into the fifth and deciding game in the finals.