She managed to grab on to him but he let her go, pushing her away so she did not get drawn out into the ocean with him.
Emergency services were alerted about 1.30pm and since then the police, Coastguard and volunteers have been carrying out exhaustive searches of the water and shoreline.
His family have been waiting at the beach for almost a week now, and told the Herald earlier this week they would not leave until his body was recovered.
Police confirmed this morning that the land search would not carry on.
Tributes have been posted online for Leka by family and friends who are struggling to comprehend what has happened.
They are using the social media hashtag #prayforleka and asking the community to keep him in their thoughts.
Posts have appeared on Facebook, Twitter and Instagram with photographs of Leka and messages of hope and support for his family.
Some of Leka's family, including his sister, have been staying at a campsite just inland from the beach that claimed him.
This week a memorial to Leka was crafted on the beach by family, including a bandanna and the teen's name spelled in rocks.
A large message, "COME BACK LEKA", was carved in the wet sand.
Whatipu Beach is not patrolled and when Leka disappeared surf lifesavers from nearby Karekare Beach raced to join the search.
Water Safety New Zealand chief executive Jonty Mills said it was vital, especially in the ocean, to stop and think before entering the water.