Nicola Sturgeon's trusty sidekick who helped propel the SNP to power
For more than a decade, Peter Murrell has been one of the most powerful people in Scottish politics.
The SNP’s previously long-serving chief executive was one of the key figures in transforming a party many saw as a laughing stock into the dominant force in Scottish politics.
A 'difficult day' for the SNP
Humza Yousaf said today was a "difficult day" for the SNP following the arrest of former chief executive Peter Murrell.
He told Sky News: "My reaction, as you'd imagine, much like anybody involved in the SNP, is that this is a difficulty for the party.
"But, again, I'd just reiterate and emphasise it's so important for me not to comment on a live police investigation and be seen to prejudice that in any way, shape or form."
He continued: "I think there'll be concern from the public but, again, there is a live police investigation under way and we will wait to see what comes at the conclusion of that police investigation."