Andrew Burke, 30, of Vincent Street, St Helen’s, was taken into custody after Cassie Hayes was murdered.
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The 28-year-old was attacked inside TUI travel agents on Chapel Street, Southport, yesterday afternoon.
She later died in hospital, with Merseyside Police saying a post-mortem exam revealed she passed away from shock and haemorrhaging.
Her devastated ex-partner, Leah Mcdonald, paid tribute to her on Facebook, writing her death has left her “dead inside”.
The couple have a young child together and despite splitting up, Leah described Cassie as her “rock”.
Ms McDonald wrote online: “I am completely dead inside my little baby is laughing and messing around its killing me that i have to tell her that her mammy has died the one person [she] adored.
“My absolute world i love you so so much have done since we first met i promise i will look after our girl the best i can.
“What can I say this girl was and has been my absolute world from the first moment we met on the 4th July 2007 till this very day.
“We had are fall outs are ups and downs but i can tell you now despite all that we absolutely loved each other and out of all the people in the world i could not of picked a better mammy for our child.”
“It is believed that the incident was domestic-related”
She added: “She’s just a gem, my best mate. Even when we split she was there for me like me for her.
“11 whole years this girl has been my rock and the most amazing mammy to our Ruby. I am heart broken and numb how anyone could do this to my Cassie.”
Police put a cordon around a large area of Southport town centre and two air ambulances landed at the scene yesterday.
Cassie’s family also paid tribute to her.
In a statement via Merseyside Police, they said: “Our whole lives have been shattered.
“This has torn our hearts from our bodies.
“Cassie was an amazing, kind human being who would do anything for anyone.
“She doted on all her family and our loss is beyond calculation.
“We ask that our family be left to grieve in private.”